CN107335326B - Desulfurization and denitrification device - Google Patents
Desulfurization and denitrification device Download PDFInfo
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- CN107335326B CN107335326B CN201710508886.4A CN201710508886A CN107335326B CN 107335326 B CN107335326 B CN 107335326B CN 201710508886 A CN201710508886 A CN 201710508886A CN 107335326 B CN107335326 B CN 107335326B
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- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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Abstract
The invention provides a desulfurization and denitrification device which can automatically analyze components of flue gas in each air box, so that a treatment device is automatically selected for the flue gas, and the flue gas in the air boxes is automatically guided into the corresponding treatment device; the operation of each processing device is automatically controlled, and the heat energy of the flue gas at each position can form advantage complementation through the communication control among the processing devices, so that the desulfurization and denitrification effects of the flue gas are maximized.
Description
Technical Field
The invention relates to the field of environmental protection, in particular to a desulfurization and denitrification device.
Background
The emission characteristics of the steel sintering flue gas multi-pollutants are as follows:
sulfur dioxide: SO in sintering flue gas2Mainly from iron ore and solid fuels (such as coal dust). The sulfur in iron ore usually exists in the form of sulfide and sulfate, the sulfur in fuel coal mostly exists in the form of organic sulfur, and the sulfide and the organic sulfur are quickly reacted with oxygen to be oxidized into SO after being decomposed2。
Nitrogen oxides. NOx generated during sintering mainly comprises NO and NO2. The NOx source is mainly divided into two parts: the first is sintering ignition stage, and the second is solid fuel combustion and high temperature reaction stage. There are mainly 3 NOx production pathways: n in air under combustion conditions2And O2Thermal NOx is generated through reaction; n in air during combustion2NO precursors such as HCN, CN and the like generated by the reaction with hydrocarbon groups in the fuel are further oxidized into NOx which is rapid NOx; nitrogen in the fuel is oxidized during combustion to fuel-type NOx.
SO2And NOx concentration varies with sintering machine location: head and tail flue gas SO2The concentration is low, and the concentration of the middle flue gas SO2 is high; tendency of NOx concentration to change in the sintering direction and SO2Different from the highest concentration at the head to the tail from the middle part of the sintering machineAnd begins to gradually decrease to a minimum value. Different stages of sintering SO2The content of NOx and the content of NOx can be changed, and simultaneously, SO in the extracted flue gas can be extracted from different positions of the sintering machine2And NOx content are also different, and SO2The flue gas treatment methods corresponding to different NOx contents are different, how to correctly judge the gas components in the flue gas extracted from different positions is achieved, and the most suitable treatment method is selected according to the gas components, so that a new problem is brought to environment-friendly workers.
Disclosure of Invention
The invention provides a desulfurization and denitrification device, which can automatically select the most appropriate treatment method for flue gas at each position, ensure that the heat energy of the flue gas at each position can form advantage complementation and maximize the desulfurization and denitrification effect of the flue gas, and is realized by the following technical scheme:
the utility model provides a SOx/NOx control device, SOx/NOx control device carries out SOx/NOx control to the flue gas that produces in the sintering machine, follows the sintering machine platform truck advancing direction of sintering machine is provided with N bellows, N bellows divide into one kind of bellows, two kinds of bellows and three kinds of bellows, one kind of bellows is through first control valve and adsorption tower intercommunication, three kinds of bellows pass through third control valve and desulfurization system intercommunication, first control valve with the third control valve all is controlled by total control system.
Further, the second type of air box is connected with a denitration system through a second control valve and is connected with a desulfurization system through a second control valve, when the second control valve is opened, the second type of air box is connected with the denitration system, when the second control valve is closed, the second type of air box is connected with the desulfurization system, and the second control valve is controlled by the main control system;
the desulfurization system is respectively provided with a first gas mixing chamber, a first reaction chamber and a dust removal chamber along a flue gas flowing passage, and an outlet of the dust removal chamber is communicated with the adsorption tower;
the denitration system is respectively provided with a second gas mixing chamber, a humidity adjusting chamber, a second reaction chamber and a product collecting chamber along a flue gas flowing passage; the first air mixing chamber is communicated with the second air mixing chamber through a fourth control valve, and the fourth control valve is controlled by the master control system; and an outlet of the product collecting chamber is communicated with the first gas mixing chamber through a fifth control valve, and the fifth control valve is controlled by the master control system.
The master control system comprises a gas component analyzer, a gas temperature analyzer, a central controller and branch controllers, wherein the gas component analyzer, the gas temperature analyzer and the branch controllers are all controlled by the central controller, and the branch controllers are used for controlling a first control valve, a second control valve, a third control valve, a fourth control valve and a fifth control valve;
a gas sensing device is arranged at a flue gas outlet of each target air box and is communicated with a master control system so that the master control system can analyze gas components according to gas sensing results, the gas analyzer comprises a zirconia matrix, the zirconia matrix is made of yttria stabilized zirconia, a first sensitive stage and a second sensitive stage are arranged at one end of the zirconia matrix side by side, the first sensitive stage and the second sensitive stage are immersed in the flue gas environment of the second type of air box, a reference electrode is arranged at the back side of the zirconia matrix, and the reference electrode is immersed in the atmosphere; the first sensing stage and the second sensing stage are both independently in communication with the reference electrode;
the gas component analyzer acquires a first electromotive force output by the first sensitive stage and a second electromotive force output by the second sensitive stage, analyzes gas components according to the first electromotive force and the second electromotive force and transmits an analysis result to the central controller; and the central controller controls a second control valve corresponding to the second type of bellows according to the analysis result.
Furthermore, on a passage through which the first gas mixing chamber and the second gas mixing chamber are communicated, a first temperature sensor is arranged on one side, close to the first gas mixing chamber, of the fourth control valve, a second temperature sensor is arranged in the second gas mixing chamber, and measurement results of the first temperature sensor and the second temperature sensor are transmitted to a gas temperature analyzer;
the gas temperature analyzer transmits the acquired temperature T2 of the second gas mixing chamber and the acquired temperature T1 of the first gas mixing chamber to a central controller, the central controller calculates a target flow rate of the gas in the first gas mixing chamber flowing into the second gas mixing chamber according to the temperature T2 of the second gas mixing chamber, the temperature T1 of the first gas mixing chamber and the volume of the second gas mixing chamber, and adjusts a fourth control valve according to the target flow rate.
Further, the concentration of SO2 in the flue gas in one type of windbox is below a first threshold, the NOx concentration is below a second threshold, and the flue gas temperature is below a fourth threshold, the second type of windbox NOx concentration is above a third threshold, and the temperature is below a fifth threshold, the third type of windbox NOx concentration is below a third threshold, and the temperature is above a fifth threshold.
Further, the first threshold value is lower than the atmospheric emission standard of SO2 concentration, the second threshold value is lower than the atmospheric emission standard of NOx concentration, and the third threshold value is a critical value for denitration treatment; the fourth threshold value is a critical value for preheating and recycling the flue gas, and the fifth threshold value is a critical value for heat exchange between the flue gases.
The invention has the beneficial effects that:
the invention provides a desulfurization and denitrification device, which has the following beneficial effects:
(1) automatically analyzing the components of the smoke in each air box, thereby automatically selecting a processing device for the smoke, and automatically guiding the smoke in the air box into the corresponding processing device;
(2) the operation of each processing device is automatically controlled, and the heat energy of the flue gas at each position can form advantage complementation through the communication control among the processing devices, so that the desulfurization and denitrification effects of the flue gas are maximized.
Drawings
FIG. 1 is a SO provided by an embodiment of the present invention2And a schematic graph of the change in concentration of NOx;
FIG. 2 is a schematic structural diagram of a desulfurization and denitrification apparatus provided by an embodiment of the invention;
FIG. 3 is a schematic view of the communication relationship between the desulfurization and denitrification apparatuses provided by the embodiment of the present invention;
fig. 4 is a schematic diagram of a control system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The sintering process is an important link of steel production, and in the sintering process, sulfides and nitrides contained in the raw materials generate pollutants such as sulfur dioxide, nitrogen oxides and the like through chemical reaction and are carried by sintering flue gas.
Sintering flue gas is different from other dust-containing gas and has unique specificity. Along the sintering machine, the smoke components drawn out by different windboxes have obvious differences. Taking the number of wind boxes as 24 as an example, as shown in FIG. 1, it was found through testing that SO2And NOx concentration varies with sintering machine location: head and tail flue gas SO2Low concentration, middle flue gas SO2The concentration is high; tendency of NOx concentration to change in the sintering direction and SO2In contrast, the concentration at the head is highest and gradually decreases to the lowest value from the middle part to the tail of the sintering machine. Average temperature of flue gas and SO in the head of sintering machine2The content of NOx and the content of NOx are lower, and the part of flue gas does not need to be subjected to desulfurization and denitrification treatment; flue gas SO of middle part of sintering machine2The NOx and the NOx are higher, but the average temperature is lower, the part of flue gas needs to be subjected to desulfurization and denitrification treatment, but the lower temperature can cause the desulfurization and denitrification treatment effect to be poor; SO of tail flue gas of sintering machine2The content is high, the desulfurization treatment is needed, but the temperature is high, obviously, the flue gas in the middle part and the tail part of the sintering machine needs to be subjected to desulfurization and/or denitrification treatment by using a chemical method, which causes two problems: (1) determining specific air box flue gas not to be subjected to desulfurization and denitrification treatment and to be subjected to desulfurization and denitrificationTreating or desulfurizing; (2) the flue gas temperature at the tail part of the sintering machine is too high, the flue gas temperature at the middle part of the sintering machine is too low, the heat energy complementation of the two kinds of flue gas can be realized, the effect of flue gas desulfurization and denitration at the middle part of the sintering machine is improved, and the effect of flue gas desulfurization at the tail part of the sintering machine is improved.
In order to achieve the two technical problems, in an exemplary embodiment of the present invention, as shown in fig. 2, the desulfurization and denitrification apparatus performs desulfurization and denitrification on flue gas generated in a sintering machine, N air boxes are arranged along a traveling direction of a sintering machine trolley of the sintering machine, the N air boxes are divided into a first-type air box 1, a second-type air box 2, and a third-type air box 3, the first-type air box 1 is communicated with an adsorption tower 4 through a first control valve 11, the third-type air box 3 is communicated with a desulfurization system 5 through a third control valve 31, and the first control valve 11 and the third control valve 31 are both controlled by a general control system (not shown in the figure).
Specifically, the second type of wind box 2 is connected with the denitration system 6 through a second control valve 21 and is connected with the desulfurization system 5 through the second control valve 21, when the second control valve 21 is opened, the second type of wind box 2 is connected with the denitration system 6, when the second control valve 21 is closed, the second type of wind box 2 is connected with the desulfurization system 5, and the second control valve 21 is controlled by the main control system; when the second control valve 21 is opened, the flue gas is discharged after passing through the denitration system 6, the desulfurization system 5 and the adsorption tower 4, and when the second control valve 21 is closed, the flue gas is discharged after passing through the desulfurization system 6 and the adsorption tower 4.
As shown in fig. 3, the desulfurization system is provided with a first gas mixing chamber, a first reaction chamber and a dust removal chamber along a flue gas flow passage, and an outlet of the dust removal chamber is communicated with the adsorption tower;
the denitration system is respectively provided with a second gas mixing chamber, a humidity adjusting chamber, a second reaction chamber and a product collecting chamber along a flue gas flowing passage; the first air mixing chamber is communicated with the second air mixing chamber through a fourth control valve, and the fourth control valve is controlled by the master control system; and an outlet of the product collecting chamber is communicated with the first gas mixing chamber through a fifth control valve, and the fifth control valve is controlled by the master control system.
In particular, SO in flue gas in a type of air box2Low NOx and low temperature, second type of windbox SO2And higher NOx concentration and lower temperature, three types of windboxes SO2Higher NOx and higher temperature, and the first-class air boxes, the second-class air boxes and the third-class air boxes are distributed along the traveling direction of the sintering machine trolley.
In the desulfurization and denitrification device described in this embodiment, a part of flue gas (second-class bellows) is discharged after passing through the denitrification system, the desulfurization system and the adsorption tower, and another part of flue gas (third-class bellows) is discharged after passing through the desulfurization system and the adsorption tower, so that the purpose of respectively treating different parts of flue gas of the sintering machine according to the components of the flue gas is achieved.
As shown in fig. 4, in order to realize the automatic analysis of the components of the flue gas and the automatic selection of the flue gas treatment device, the general control system comprises a gas component analyzer, a gas temperature analyzer, a central controller and branch controllers, wherein the gas component analyzer, the gas temperature analyzer and the branch controllers are all controlled by the central controller, and the branch controllers are used for controlling a first control valve, a second control valve, a third control valve, a fourth control valve and a fifth control valve;
and a gas sensing device is arranged at the smoke outlet of each target air box. The target windboxes are those that are not determined to be of the second type or the third type, i.e., those excluding a number of windboxes located at the head of the sintering machine (which may be determined as one type) and a number of windboxes located at the tail of the sintering machine (which may be determined as three types). Specifically, the number of one type of bellows and three types of bellows may be set empirically. The gas sensing device is communicated with the master control system so that the master control system can analyze gas components according to gas sensing results.
The gas sensing device comprises a zirconia matrix, wherein the zirconia matrix is made of yttria stabilized zirconia, one end of the zirconia matrix is provided with a first sensitive stage and a second sensitive stage side by side, the first sensitive stage and the second sensitive stage are both immersed in the smoke environment of a second type of bellows, the back side of the zirconia matrix is provided with a reference electrode, and the reference electrode is immersed in the atmosphere; the first sensing stage and the second sensing stage are both independently in communication with the reference electrode; the first sensitive electrode is made of a composite material of NiO and a zirconia ceramic material with the yttrium oxide content of 5-8 mole%; the second sensitive electrode is composed of a CuO layer and a covering layer, and the covering layer is made of spinel material containing 0-10 Vol% of Mn element.
The gas component analyzer acquires a first electromotive force output by the first sensitive stage and a second electromotive force output by the second sensitive stage, analyzes gas components according to the first electromotive force and the second electromotive force and transmits an analysis result to the central controller; and the central controller controls a second control valve corresponding to the second type of bellows according to the analysis result.
Specifically, the gas component analyzer stores therein a correspondence between a first electromotive force and an NO concentration, and a second electromotive force and NO2The gas component analyzer analyzes the concentration of NOx according to the first electromotive force and the second electromotive force and transmits the concentration of NOx to a central controller, if the concentration of NOx is greater than a preset threshold value, the current flue gas needs denitration, the air boxes corresponding to the flue gas are second-class air boxes, and the central controller controls the second control valves corresponding to the air boxes to be opened; if the concentration of the NOx is not greater than the preset threshold, the current flue gas does not need denitration, the air boxes corresponding to the flue gas are three types of air boxes, and the central controller controls the second control valves corresponding to the air boxes to be closed.
In the actual control process, the SO2 concentration in the flue gas in the first type of windbox is below the first threshold, the NOx concentration is below the second threshold, and the flue gas temperature is below the fourth threshold, the second type of windbox NOx concentration is above the third threshold, and the temperature is below the fifth threshold, the third type of windbox NOx concentration is below the third threshold, and the temperature is above the fifth threshold.
The first threshold value is lower than the atmospheric emission standard of SO2 concentration, the second threshold value is lower than the atmospheric emission standard of NOx concentration, and the third threshold value is a critical value for carrying out denitration treatment; the fourth threshold value is a critical value for preheating and recycling the flue gas, and the fifth threshold value is a critical value for heat exchange between the flue gases. Therefore, the flue gas in the first-class air box can directly enter an adsorption tower for dust adsorption and then is discharged into the atmosphere without chemical treatment and preheating recovery; the flue gas of the second type of air box needs to be subjected to denitration treatment, so that the flue gas enters a denitration system and is discharged into the atmosphere after passing through a desulfurization system and an adsorption tower; the flue gas of the three types of air boxes does not need to pass through a denitration system, and can be discharged into the atmosphere after passing through a desulfurization system and an adsorption tower. It should be emphasized that although the flue gas in the three types of windboxes also has partial NOx, the desulfurization system also has certain capacity of clearing NOx, so the flue gas in the three types of windboxes does not need to be treated by the denitration system.
Through the device, the embodiment of the invention automatically determines which specific air box flue gas is not subjected to desulfurization and denitrification treatment, is subjected to desulfurization and denitrification treatment or is subjected to desulfurization treatment, and can realize the function of switching the corresponding treatment device in real time according to the flue gas composition.
Furthermore, as can be seen from the above, the temperature of the flue gas in the second-type air box is lower than the fifth threshold, and the temperature of the flue gas in the third-type air box is higher than the fifth threshold, so that the flue gas in the second-type air box and the flue gas in the third-type air box have heat exchange conditions. Due to the working characteristics of the sintering machine, the temperature of the flue gas of the three types of air boxes is far higher than that of the flue gas of the two types of air boxes, and the flue gas of the three types of air boxes firstly enters the desulfurization device, so that the flue gas is led out from the first gas mixing chamber of the desulfurization device to the second gas mixing chamber of the denitrification device, the flue gas in the second gas mixing chamber is controlled within a preset temperature range through flue gas heat transmission, and the denitrification device can achieve the best denitrification effect within the temperature range.
In order to ensure that the temperature of the flue gas in the second gas mixing chamber is within the temperature range, a first temperature sensor is arranged on one side, close to the first gas mixing chamber, of the fourth control valve on a passage communicated with the first gas mixing chamber, a second temperature sensor is arranged in the second gas mixing chamber, and measurement results of the first temperature sensor and the second temperature sensor are transmitted to a gas temperature analyzer;
the gas temperature analyzer transmits the acquired temperature T2 of the second gas mixing chamber and the acquired temperature T1 of the first gas mixing chamber to a central controller, the central controller calculates a target flow rate of the gas in the first gas mixing chamber flowing into the second gas mixing chamber according to the temperature T2 of the second gas mixing chamber, the temperature T1 of the first gas mixing chamber and the volume of the second gas mixing chamber, and adjusts a fourth control valve according to the target flow rate, so that the temperature of the second gas mixing chamber is controlled, the temperature of the second gas mixing chamber is ensured to be within the temperature range, and the heat energy resource of the first gas mixing chamber is fully utilized.
Specifically, the denitration device comprises a second gas mixing chamber, a humidity adjusting chamber, a second reaction chamber and a product collecting chamber. Setting the temperature interval of the second gas mixing chamber as [ T ]A,TB]After the humidity adjustment is carried out in the humidity adjustment chamber, the temperature interval of the second reaction chamber is [ T ]C,TD]In the temperature interval of [ TC,TD]Namely the optimal reaction temperature interval of the denitration reaction.
The second reaction chamber is provided with an ammonia gas inlet, the ammonia gas inlet is used for inputting ammonia gas into the second reaction chamber, a sixth control valve is arranged at the ammonia gas inlet, and the sixth control valve is controlled by the master control system. The wall of the second reaction chamber is also provided with a plurality of exit window mounting tables, and an electron generator is arranged outside each exit window mounting table and comprises a vacuum chamber with a certain width; an electron generating device located in the vacuum chamber for generating electrons; and an elongated nozzle extending from the vacuum chamber along a longitudinal axis, the nozzle being mounted at a tip thereof above the exit window mounting table, the electron eye generated by the electron generator being incident on the exit window mounting table into the second reaction chamber; the electronic generators are all controlled by the master control system.
And ammonia gas is sprayed into the ammonia gas inlet of the second reaction chamber. After the flue gas enters the second reaction chamber, a large amount of free radicals are generated under the action of electrons, so that NOx in the flue gas and NH3 are subjected to complex and rapid chemical reaction on ammonium nitrate particles, and denitration is realized.
And further, the ammonium nitrate enters a product collecting chamber, and ammonium nitrate in the flue gas is captured in an electrostatic dust removal mode. And finally, the NOx in the flue gas discharged from the product collecting chamber can reach the national specified concentration, the NOx enters the first gas mixing chamber through the fifth control valve again, enters the adsorption tower together with the flue gas in the three types of air boxes needing desulfurization after being treated by the desulfurization system, and is discharged into the atmosphere through the adsorption tower. Specifically, a large amount of active carbon particles are distributed in the adsorption tower.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. A desulfurization and denitrification device is characterized in that:
the desulfurization and denitrification device is used for performing desulfurization and denitrification treatment on flue gas generated in a sintering machine, N air boxes are arranged along the traveling direction of a sintering machine trolley of the sintering machine and are divided into a first air box (1), a second air box (2) and a third air box (3), the first air box (1) is communicated with an adsorption tower (4) through a first control valve (11), the third air box (3) is communicated with a desulfurization system (5) through a third control valve (31), and the first control valve (11) and the third control valve (31) are controlled by a master control system; SO in flue gas in first-class air box2Low NOx and low temperature, second type of windbox SO2And higher NOx concentration and lower temperature, three types of windboxes SO2The first-class air box, the second-class air box and the third-class air box are distributed along the traveling direction of the sintering machine trolley;
the second type of bellows (2) is connected with the denitration system (6) through a second control valve (21); when the second control valve (21) is opened, the flue gas is discharged after passing through the denitration system (6), the desulfurization system (5) and the adsorption tower (4), and when the second control valve (21) is closed, the flue gas is discharged after passing through the desulfurization system (6) and the adsorption tower (4);
the desulfurization system is respectively provided with a first gas mixing chamber, a first reaction chamber and a dust removal chamber along a flue gas flowing passage, and an outlet of the dust removal chamber is communicated with the adsorption tower;
the denitration system is respectively provided with a second gas mixing chamber, a humidity adjusting chamber, a second reaction chamber and a product collecting chamber along a flue gas flowing passage; the first air mixing chamber is communicated with the second air mixing chamber through a fourth control valve, and the fourth control valve is controlled by the master control system; an outlet of the product collecting chamber is communicated with the first gas mixing chamber through a fifth control valve, and the fifth control valve is controlled by the master control system;
the master control system comprises a gas component analyzer, a gas temperature analyzer, a central controller and branch controllers, wherein the gas component analyzer, the gas temperature analyzer and the branch controllers are all controlled by the central controller, and the branch controllers are used for controlling a first control valve, a second control valve, a third control valve, a fourth control valve and a fifth control valve;
a gas sensing device is arranged at the smoke outlet of each target air box; the target air box is an air box which is not determined to be a second type air box or a third type air box, namely, a plurality of air boxes positioned at the head part of the sintering machine and other air boxes except the plurality of air boxes positioned at the tail part of the sintering machine are excluded; automatically judging the type of the target bellows through a gas sensing device, and automatically processing the type of the target bellows;
in order to ensure that the temperature of the flue gas in the second gas mixing chamber is within a preset temperature interval,
on a passage through which the first gas mixing chamber and the second gas mixing chamber are communicated, a first temperature sensor is arranged on one side, close to the first gas mixing chamber, of the fourth control valve, a second temperature sensor is arranged in the second gas mixing chamber, and measurement results of the first temperature sensor and the second temperature sensor are transmitted to a gas temperature analyzer;
the gas temperature analyzer transmits the acquired temperature T2 of the second gas mixing chamber and the acquired temperature T1 of the first gas mixing chamber to a central controller, the central controller calculates a target flow rate of gas flowing into the second gas mixing chamber from the first gas mixing chamber according to the temperature T2 of the second gas mixing chamber, the temperature T1 of the first gas mixing chamber and the volume of the second gas mixing chamber, and adjusts a fourth control valve according to the target flow rate, so that the temperature of the second gas mixing chamber is controlled, the temperature of the second gas mixing chamber is ensured to be within the temperature range, and the heat energy resource of the first gas mixing chamber is fully utilized;
the denitration device comprises a second gas mixing chamber, a humidity adjusting chamber, a second reaction chamber and a product collecting chamber; an ammonia gas inlet is arranged in the second reaction chamber and used for inputting ammonia gas into the second reaction chamber, a sixth control valve is arranged at the ammonia gas inlet and is controlled by the master control system; the wall of the second reaction chamber is also provided with a plurality of exit window mounting tables, and an electron generator is arranged outside each exit window mounting table and comprises a vacuum chamber with a certain width; an electron generating device located in the vacuum chamber for generating electrons; and an elongated nozzle extending along a longitudinal axis from the vacuum chamber, the nozzle tip mounted above the exit window mounting table, electrons generated by the electron generator being emitted into the second reaction chamber along the exit window mounting table; the electronic generators are all controlled by the master control system;
ammonia gas is sprayed into an ammonia gas inlet of the second reaction chamber; after the flue gas enters the second reaction chamber, a large amount of free radicals are generated under the action of electrons, and denitration is realized.
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